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# File railties/lib/rails/railtie.rb, line 199def run_tasks_blocks(app)#:nodoc:extendRake::DSLself.class.rake_tasks.each{|block|instance_exec(app,&block)}# Load also tasks from all superclassesklass=self.class.superclasswhileklass.respond_to?(:rake_tasks)klass.rake_tasks.each{|t|instance_exec(app,&t)}klass=klass.superclassendend